Sierra Wireless AirLink LS300 User Manual page 18

AirLink LS300 User Guide
18
• As a digital output, it can trigger an alarm, siren, door lock or opens a valve
or a switch. Pin 4 is an open collector transistor output normally at 3.3VDC.
When triggered, it is pulled to ground. The initial state of the digital output
when the device is rebooted is configurable in ALEOS.
3.3 VDC
51 K
Internal
Pull Up
Pin 4
Digital Output
Pin 4 is normally
at 3.3V but is pulled
down to 0V when activated
Figure 2-3: Digital Output Operation
• As an analog voltage input, it detects inputs of 0–30VDC across this pin to
ground. When used with a converter to transform values into voltages, it
monitors measurements like temperatures, pressures or the volume of liquid
in a container. ALEOS can transform these voltages into meaningful values.
In ALEOS, events reporting tells the device to perform an action when a
specified voltage is detected.
Pin 4
Analog Voltage Input
Figure 2-4: Analog Voltage Input Operation
+12 VDC
CL+
CL-
(Exact voltages and configuration
will depend on the actual system design)
Storage Tank
Green Wire Level Detector
Device set to send
email warning when
tank is almost empty
(5V seen on Pin 4)
COM
NC
NO
External Relay Circuit
Level Full
Detector Ouput
Voltage=20V
Storage
Tank
Level Almost Empty
Detector Ouput
Voltage=5V
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